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UCC28630D Datasheet(PDF) 10 Page - Texas Instruments |
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UCC28630D Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 68 page  HV VDD DRV VO Sample VIN Sample VREF Voltage Loop Compensation CV Demand Isw Sample PIN Compute PIN=(VIN x ISW(MID))x(tON/tSW) VIN ISW(mid) tON tSW VO PIN PLIM + ILIM x VO Current Loop Compensation CC Demand + + VREF x 120% OVP Fault FM + AM Modulator Sleep Timer + tSW IPK(dem) IDD(LIMIT) and IHV(MEAS) Fault Filtering and Status Monitor Start-Up and Bias Control PWM Comparator + VTRIP(sd) SD Fault Q S R IPK(dem) SD Fault OVP Fault Overload Timer OCP Fault OCP Fault + VTRIP(TEMP) Internal Temp Sensor Over-Temp Fault tON(max) tON(min) tON tSMP1 tSMP2 tSMP3 + + VDD VVDD(ov) VVDD(uv) VDD OV Fault VDD UV Fault VDD OV Fault VDD UV Fault Over-Temp Fault Timing and Trigger Generation / tON(max) tON(min) tSMP,n n X-Cap Fault tSW JFET Control PWM Enable PWM Enable X-Cap Discharge Detect JFET Control IHV(meas) tSMP4 X-Cap Fault tSW tON + VAC(min) Line UV Fault Line UV Fault Min Demand VO 4 GND 3 CS 2 SD 1 VSENSE 5 6 8 UCC28630 SLUSBW3A – MARCH 2014 – REVISED MARCH 2014 www.ti.com 8 Detailed Description 8.1 Overview The UCC28630 device is a highly-integrated, primary-side-regulated (PSR) flyback controller. The device supports magnetically-sensed output voltage regulation via the transformer bias winding. This feature eliminates the need for a secondary-side reference, error amplifier and opto-isolator. The device employs an advanced internal control algorithm that offers accurate static output voltage regulation against line and load. The fixed- point, magnetic-sampling scheme allows operation in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Additionally, the device achieves accurate constant-current (CC) control of the output current limit using only primary-side, current sensing. Uniquely, this CC function operates seamlessly as the operating mode changes between DCM and CCM operation. The controller includes an internal, high-voltage (HV) start-up current-source, and employs low-power sleep modes and switching frequency reduction, to improve light-load efficiency and standby power. The device typically achieves standby power levels between 0.05% and 0.1% of peak output power. The controller operates in either DCM and CCM, using a mix of peak current-mode PWM (AM) and switching- frequency modulation (FM) schemes. The control approach improves performance (efficiency, size and cost) and can reduce transformer size and cost by allowing operation in CCM with FM during peak overload conditions. Extensive protection features are incorporated, including output overvoltage protection (OVP), bias rail overvoltage and undervoltage (OV/UV), active X-capacitor discharge, line undervoltage and brownout protection, overcurrent overload timer, open- and short-circuit terminal protections, peak current adjustment with line and frequency dither for system EMI reduction. 8.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: UCC28630 |
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